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With blocks, it is only legal to modify a local variable declared outside the block s scope if the variable is declared with the __block keyword. In this case, the success variable is declared locally outside the block, but is modified within the block, so it must be prefixed with the __block keyword. On the other hand, the lastError variable is a member variable of the class. Member variables can be modified within blocks without the use of the __block keyword. Also, in the case of Game Kit, you ll be frequently passing block objects to Game Kit methods, but the block objects won t be run until a later time. You are probably used to code being executed in sequence, but in Game Kit programming it is not! The block passed to a Game Kit method is only called when the call completes a round trip to and from the Game Center server. That takes time because data needs to be transmitted to the Game Center servers and processed, and then a result needs to be returned to the device. Only then does the block object gets executed. Let s take an example. You may find yourself tempted to write something like this:

ABS(n) BITAND(n,m) CEIL(n) COS(n), COSH(n), ACOS(n) EXP(n) FLOOR(n) LN(n), LOG(m,n) MOD(m,n) POWER(m,n) REMAINDER(m,n) ROUND(n[,m]) SIGN(n)

__block bool success = NO; [localPlayer authenticateWithCompletionHandler:^(NSError* error) { success = (error == nil); }]; if (success) NSLog(@ Local player logged in! ); else NSLog(@ Local player NOT logged in! );

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As well as the standard /dev/hda1, /dev/sda2 notation that you re probably used to for referring to disks, Linux also provides universal unique identifier (UUID) notation. The major advantage of this is that, unlike the /dev notation, it s linked specifically to a particular piece of hardware. So, although /dev/ notation can shift between disks depending on how they re plugged in, if you use UUID, this shouldn t happen. This avoids the possibility of a system reconfiguration causing disks to be renamed and thus causing knock-on breakage of things that reference that disk. The first part of this is to find out the existing UUID of your disks; you can do this using the blkid command: > blkid /dev/hda1 /dev/hda1: UUID="0ef96300-36c0-4575-8a1d-2d36ff4cd585" SEC_TYPE="ext2" TYPE="ext3"

Absolute value of n Logical AND over binary representations of n and m Smallest integer greater than or equal to n Cosine, hyperbolic cosine, arccosine e (2.71828183...) raised to the nth power Largest integer less than or equal to n Natural logarithm of n, or logarithm base m Remainder of m divided by n (returns m if n is 0; result rounded with FLOOR) m raised to the nth power Remainder of m divided by n (n = 0 returns an error; result rounded with ROUND) n rounded to m positions (default m = 0) If n < 0, n = 0, n > 0: respectively, -1, 0, and 1

However, this example will always report that the player is not logged in. Why Well, the execution path is such that the authenticateWithCompletionHandler will take your block as a parameter and store it while it sends a request to the server and waits for the response to come back. However, the execution continues right away after the authenticateWithCompletionHandler method, and that s where the success variable decides which log statement to print. The problem is, the success variable is still set to NO because the block hasn t been executed yet. Several milliseconds later, the server responds to the authentication and that triggers the completion handler the block object to be run. If it returns without error, the success variable is set to YES. But alas, your logging code has already been run, so the assignment has no effect.

SIN(n), SINH(n), ASIN(n) SQRT(n) TAN(n), TANH(n), ATAN(n), ATAN2(n,m) TRUNC(n[,m]) WIDTH_BUCKET(e,min,max,nb)

The Debian/Ubuntu package to install is request-tracker3.6, which comes along with a stack of Perl module packages: apt-get install request-tracker3.6 One slight installation niggle in the Debian package is that apache is a dependency, which is a nuisance if you already have apache2 installed. To use your existing apache2 install instead, use this: apt-get install libapache2-mod-perl2 rm /etc/init.d/apache The last line will avoid having both Apache and Apache2 starting at bootup, which would be a nuisance. Follow the instructions in /usr/share/doc/request-tracker3.6/NOTES.Debian.gz to complete the basic install and set up the database back end. If you re using Apache2, you ll also need to edit the provided modperl file to comment out this line: PerlFreshRestart Off You need to either install a database (which I won t cover here) or install the database client package if you already have a database server on another machine. I ll assume from here on that you re using MySQL on another server.

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